Vacuum propeller plane



Feb. 7, 1933. o. c. KROGH 1,896,089

' VACUUM PROPELLER PLANE Filed June 27. 1931 2 Sheets-Sheet l z1; y a c R a ZE2 v I I 2 Feb. 7, 1933, o. c. KROGH VACUUM PHOPELLER PLANE Filed June 27, 1931 2 Sheets-Sheet 2 r ams F b. 1.1m

UNITED STATES PATENT OFFICE '1'10 CHBIBTDTSH KBOGE, OI ODENSE, DENMARK VACUUH PROPELLER PLANE Application fled June 87, 1981, Serial No. 547,860, and in Denmark July 29, 1939.

My invention relates to a vacuum propeller plane, consisting of a plain, circular disk on one side of which are mounted airrarefying planes, which when rotating together with the said dlsk, will produce a lower pressure thanthe atmospherical pressure on the sideof the disk to which the are fixed, while the opposite side of the disk approximately is subjected to the pressure 9 of the atmosphere. p

The produced difference of pressure can be utilized for propulsion of a body in the direction of the axis of the rotation shaft, for

instance for aeroplanes, or for producing air currents for ventilation purposes, dust suckers and the like.

It is well-known that the bearing-planesof aero lanes are current-line shaped in order to pr uce, by a certain speed, a lower pressure (vacuum) on the upper side of the planes, which in co-action with the pressure on the under side gives the necessary buoyancy to the aero lanes.

It is also wellown to 've the air-proeller blades 9. current-line fi iaped fore-side, y which means, a lower pressure is roduced on this fore-side, whilst the'back si e, which is placed aslant presses the air together, if

30 anything, but as the air can stream freely from the front to the back side in the rotation plane of the ropeller, the produced vacuum is not turne to account to such a degree as by my invention.

By means of my vacuum propeller plane it is possible to obtain a considerably greater 'buo ancy or .propulsion than by formerly used elements.

When utilized in aero lanes their safety will increase, and they wi be able to go vertically upward, to stand still in the air, or 30 End without the often sofatal sliding i t. the ventilation technics the invention can be utilized in agricultural machines, dryin installations, dust suckers and the like.

y invention is illustrated in the accompanying drawing, in which Figure 1 shows the vacuum propeller plane in top view; Fig. 2 a section on the hue AB, in F g. 1;

Fig. 3 a section on the line 'CD, in Fig. 1, and v Fig. 4-the vacuum propeller plane in per spective, whilst Fig. 5 shows a number of vacuum planes decreasing in radiate direc- 56 tion and mounted on a common shaft.

In Fig. 1 a round disk 1 is provided with a shaft 2, the hub of which is concentrical with the disk.

Two air-raregying planes 3 and 4 are 00 mounted on the isk 1 in such a manner that they turn their current-line sha ed side upward, while their plain under si e is fastened to the disk 1.

'The fore-edges 5 and 6 of the air-raref in 66 planes 3 and 4 are lying radiately on the dis% '1, and the back edges 7 and 8, which are parallel with the fore-edges 5 and 6,- form tangents to the circumference of the disk 1.

Fi s. 2 and 3 show' sections of the air- 7 rare ying planes, in the left and the right side relatively. The air-rarefyin planes are hollow and madein a manner ike that of the bearing-planes of an aeroplane.

In Fig. 4 the arrow indicates the direction 7 of the rotation of the vacuum ropeller plane.

By the quick rotation of t e vacuum propeller plane the relative movement of the air, immediately 'above the air-rarefying planes, partly will follow current-lines, by 30 which means the lower pressure as known from the current-line theory is produced on the upper side of the air-rarefying planes. The underside of the disk 1. being plain,

nearly a normal air-pressure will be reigning here.

As the air-rarefying planes 3 and 4 are connected mutually by the disk 1, the pieces 9 and 10 of the disk, see Fig. 4, will prevent a balancing of the pressure so that the vacuum produced by the planes 3 and 4 gets active on the whole areaof the disk 1, and thus the superiority of my vacuum propeller plane, as to utilizing the obtained, difference of pressure, is fully explained. Instead of straight back sides 7 and 8, the back side of the air-rarefying planes can be shaped according to the riphery of the disk, and the cross-section o the air-rarefying lanes can decrease in the direction of the ra ius of the disk 1, in order to make the formation of the current-line as eas as possible.

Having thus described my invention, I claim:

- 5 1. In vacuum pro eller planes the combination, with a circu ar disk, of a number of current-line shaped air-rarefying -planes mounted on one side of the said disk, and means for rotating the said disk in order to obtain a lower pressure all over its area on that side, on which the air-rarefying planes are mounted.

2. In vacuum propeller planes the combination, with a disk, of air-rarefying planes mutually connected by the said disk and having their back sides shaped according to the periphery of the disk, on one side of which they are mounted.

3. In "acuum propeller planes the combination, with a (118k, of air-rarefying planes mounted on one side of the disk, and the cross section of which decreases outward in radiate direction, correslponding to the speed.

4. In vacuum propel 'er planes the combination of at least one disk on one side of which air-rarefying planes are mounted, a number ofgroups of such planes, and a common shaft.

In witness whereof I have hereunto set 9 my hand.

OTTO CHRISTENSEN KROGH. 

